Getting a little creeped out....

I am in the middle of a mystery. Someone sent me a piece of mail from a part of the US that I have never been to. What they sent wasn't creepy. However,I wasn't given a full name, they didn't give me a return address, and they had my full name and address on the envelope. Not sure what is going on....it is just a little unnerving. If any of you sent it to me, let me know. That way I can thank you and stop being a little creeped out.